GM Crankshaft Identification
GM Crankshaft Identification
Use these casting numbers to identify the crankshaft you have.
Small Block Casting numbers
Casting Number |
CID |
Years |
Journals |
Stroke
|
Comments |
1130 |
307/327 |
68-73 |
2.45/2.10 |
3.25 |
Nodular Iron |
1178 |
302 |
|
2.45/2.10 |
3 |
Forged |
1181 |
305/350 |
68-76 |
2.45/2.10 |
3.48 |
Nodular Iron |
1182 |
350 |
|
2.45/2.10 |
3.48 |
Forged |
2680 |
327 |
|
2.30/2.00 |
3.25 |
Forged |
2690 |
350 |
|
2.45/2.10 |
3.48 |
Forged |
3279 |
302 |
68-69 |
2.45/2.10 |
3 |
Forged |
4577 |
327 |
62-67 |
2.3/2.0 |
3.25 |
Nodular Iron |
4672 |
307/327 |
68-73 |
2.45/2.10 |
3.25 |
Nodular Iron |
310514 |
350 |
77-85 |
2.45/2.10 |
3.48 |
Nodular Iron |
330550 |
350 |
73-75 |
2.45/2.10 |
3.48 |
Forged |
354431 |
262 |
75-76 |
2.45/2.10 |
3.1 |
Nodular Iron |
3727449 |
283 |
57-67 |
2.3/2.0 |
3 |
Forged |
3729449 |
265 |
55-57 |
2.3/2.0 |
3 |
Forged |
3734627 |
327 |
62-67 |
2.3/2.0 |
3 |
Forged |
3735236 |
265/283 |
55-67 |
2.3/2.0 |
3 |
Forged |
3735263 |
283 |
57-63 |
2.3/2.0 |
3 |
Forged |
3782680 |
327 |
62-67 |
2.3/2.0 |
3.25 |
Forged |
3814671 |
327 |
|
2.30/2.00 |
3.25 |
Forged |
3815822 |
265/283 |
55-67 |
2.3/2.0 |
3 |
Forged |
3835236 |
283 |
57-65 |
2.3/2.0 |
3 |
Forged |
3836266 |
265/283 |
56-63 |
2.3/2.0 |
3 |
Forged |
3849847 |
283 |
57-67 |
2.3/2.0 |
3 |
Forged |
3876764 |
283 |
64-67 |
2.3/2.0 |
3 |
Nodular Iron |
3876768 |
283 |
64-67 |
2.3/2.0 |
3 |
Nodular Iron |
3884577 |
327 |
|
2.30/2.00 |
3.25 |
Forged |
3892690 |
350 |
68-85 |
2.45/2.10 |
3.48 |
Forged |
3911001 |
307/327 |
68-73 |
2.45/2.10 |
3.25 |
Nodular Iron |
3911011 |
307/327 |
68-73 |
2.45/2.10 |
3.25 |
Nodular Iron |
3914672 |
327 |
|
2.45/2.10 |
3.25 |
Forged |
3923279 |
302 |
|
2.45/2.10 |
3 |
Forged |
3932442 |
305/350 |
69-85 |
2.45/2.10 |
3.48 |
Nodular Iron |
3941174 |
307/327 |
68-73 |
2.45/2.10 |
3.25 |
Nodular Iron |
3941178 |
302 |
68-69 |
2.45/2.10 |
3 |
Forged |
3941182 |
350 |
68-76 |
2.45/2.10 |
3.48 |
Forged |
3941188 |
350 |
|
2.45/2.10 |
3.48 |
Forged |
3949847 |
283 |
64-67 |
2.3/2.0 |
3 |
Nodular Iron |
3951130 |
327 |
|
2.45/2.10 |
3.25 |
Forged |
3951529 |
400 |
70-80 |
2.65/2.10 |
3.75 |
Nodular Iron |
10106122 |
350 |
90-95 |
2.76/2.10 |
3.66 |
Forged LT-5 ZR-1 |
10168568 |
265 |
|
2.45/2.10 |
3 |
Cast One Piece Seal |
12552216 |
346 |
|
2.558/2.10 |
3.62 |
Cast LS-1 One Piece Seal |
14088526 |
305 |
1986 |
2.45/2.10 |
3.48 |
Nodular Iron One piece seal |
14088532 |
350 |
86-88 |
2.45/2.10 |
3.48 |
Forged One piece seal |
14088535 |
305/350 |
86 & UP |
2.45/2.10 |
3.48 |
Nodular Iron One piece seal |
14088552 |
350 |
86 & UP |
2.45/2.10 |
3.48 |
Forged One piece seal |
|
|
|
|
|
|
Big Block Crankshaft
Casting Number |
CID |
Years |
Journals |
Stroke |
Comments |
3520 |
454 |
|
2.75/2.20 |
4 |
Forged |
3521 |
454 |
70-88 |
2.75/2.20 |
4 |
Forged LS-6 |
3524 |
454 |
|
2.75/2.20 |
4 |
Forged |
6223 |
366/396/402/427 |
68-76 |
2.75/2.20 |
3.76 |
Forged |
7115 |
366/396/402/427 |
65-76 |
2.75/2.20 |
3.76 |
Forged |
7416 |
454 |
70-88 |
2.75/2.20 |
4 |
Forged |
7463 |
454 |
|
2.75/2.20 |
4 |
Forged |
336782 |
454 |
|
2.75/2.20 |
4 |
Cast |
353039 |
454 |
70-88 |
2.75/2.20 |
4 |
Nodular Iron |
353638 |
454 |
|
2.75/2.20 |
4 |
|
359730 |
454 |
|
2.75/2.20 |
4 |
|
3732692 |
348 |
|
2.75/2.20 |
4 |
|
3732692 |
348 |
1958 |
2.50/2.20 |
3.25 |
Forged |
3733223 |
409 |
62-65 |
2.50/2.20 |
3.5 |
Forged |
3733223 |
348 |
|
2.50/2.20 |
3.25 |
Forged |
3733226 |
348 |
|
2.50/2.20 |
3.25 |
Forged |
3733226 |
348 |
1958 |
2.50/2.20 |
3.25 |
Forged |
3741640 |
348 |
|
2.50/2.20 |
3.25 |
Forged |
3741640 |
348 |
59-61 |
2.50/2.20 |
3.25 |
Forged |
3741642 |
348 |
|
2.50/2.20 |
3.25 |
Forged |
3741642 |
348 |
59-61 |
2.50/2.20 |
3.25 |
Forged |
3788072 |
409 |
1961 |
2.50/2.20 |
3.5 |
Forged |
3788072 |
409 |
|
2.50/2.20 |
3.5 |
Forged |
3795589 |
409 |
61-62 |
2.50/2.20 |
3.5 |
Forged |
3795589 |
409 |
|
2.50/2.20 |
3.5 |
Forged |
3804816 |
366/396/402/427 |
61-76 |
2.75/2.20 |
3.76 |
Nodular Iron |
3815822 |
348 |
58-61 |
2.50/2.20 |
3.25 |
Forged |
3815822 |
348 |
|
2.50/2.20 |
3.25 |
Forged |
3824553 |
348 |
58-61 |
2.50/2.20 |
3.25 |
Forged |
3824553 |
348 |
|
2.50/2.20 |
3.25 |
Forged |
3829027 |
409 |
|
2.50/2.20 |
3.5 |
Forged |
3829027 |
409 |
1963 |
2.50/2.20 |
3.5 |
Forged |
3837466 |
409/427 |
|
2.50/2.20 |
3.65 |
Forged Z-11Special performance |
3837466 |
409 |
1963 |
2.50/2.20 |
3.5 |
Forged Z-11 |
3838416 |
409 |
64-65 |
2.50/2.20 |
3.5 |
Forged |
3838416 |
409 |
|
2.50/2.20 |
3.5 |
Forged |
3856223 |
396/402 |
65-71 |
2.75/2.20 |
3.76 |
Nodular Iron |
3863114 |
402 |
|
2.75/2.20 |
3.76 |
|
3863144 |
366/396/402 |
68-85 |
2.75/2.20 |
3.76 |
Forged |
3874874 |
366/396/402/427 |
66-85 |
2.75/2.20 |
3.76 |
Forged |
3879621 |
427 |
|
2.75/2.20 |
3.76 |
Forged |
3882841 |
396 |
|
2.75/2.20 |
3.76 |
Forged |
3882842 |
366/396/427 |
|
2.75/2.20 |
3.76 |
Forged |
3882849 |
366/396/427 |
|
2.75/2.20 |
3.76 |
Forged |
3887114 |
396 |
|
2.75/2.20 |
3.76 |
Forged Special performance |
3904815 |
366/396/402/427 |
65-76 |
2.75/2.20 |
3.76 |
Nodular Iron |
3962523 |
454 |
|
2.75/2.20 |
4 |
Forged |
3963521 |
454 |
|
2.75/2.20 |
4 |
Forged Special performance |
3963524 |
454 |
70-72 |
2.75/2.20 |
4 |
Forged |
3965746 |
NA |
|
NA |
NA |
Semi finished Forged crank |
3965753 |
NA |
|
NA |
NA |
Semi finished Forged |
3967416 |
454 |
70-71 |
2.75/2.20 |
4 |
Forged |
3967463 |
454 |
70-88 |
2.75/2.20 |
4 |
Forged |
3975495 |
454 |
|
2.75/2.20 |
4 |
|
3975945 |
454 |
|
2.75/2.20 |
4 |
|
3993804 |
NA |
|
NA |
NA |
Raw Forged crank |
3993878 |
454 |
|
2.75/2.20 |
4 |
Forged |
10051169 |
NA |
|
NA |
NA |
Raw Forged |
10114186 |
427 |
|
2.75/2.20 |
3.76 |
Forged |
10114187 |
396 |
|
2.75/2.20 |
3.76 |
Cast |
10114188 |
454 |
|
2.75/2.20 |
4 |
Cast One Piece Seal |
14097044 |
454/502 |
|
2.75/2.20 |
4 |
Forged One Piece Se |
